Heavy duty abrasion resisting chain



'Dec. 28, 1937.

L; T. HARRIS HEAVY DUTY ABRASION RESISTING CHAIN 'Filed Oct. 12, 1956 new Dec.28,1937 2,103,972

, 2,102,072 I nmvx nu'rr ABRABION nasrs'rmo onam Leonard '1. Harris. Chicag: Heights, 11]., minor, by memo alslgnmen to The American Brake Shoe & Foundry 00., New York, N. Y.,

a corporation of Delaware Application Qctoberlz, 1938, Serial No. 105,228

4 Claims.

Links of heavy duty chains-for instance, 'chains used for pulling dragline buckets and therefore restricted as to weight and requiringlong endurance underabrasive influences-so long as sitioned; and the opposite faces of the link-ends and ridges of the sides provide perimetrically continuous wearing surfaces in two parallel planes.

' they retain a design and sectional dimensions In the accompanying drawing-- 5 assuring desired tensile strength in their side Figure 1 shows a portion of a chain constructed bars and rigidity against deformation of their in accordance with the invention and including arcuate ends, lend themselves to special distrian intermediate link in face view, a portion of bution of their metal masses, bestowing upon an interengaged link in edge elevation, and a m them longer duration of service and superior third link in longitudinal axial section; and functioning in use, especially when the chain is Figure 2 is a transverse section in a plane indiof the so-called "coil" type. cated by the line 2x2:r of Figure 1, and includ- It is an object of the present invention to proing the strut of the link. vide a link design available for chains in general i, I represent the arcuate ends of a heavy duty and appropriate to the type of chain referred to link and 2, 2, the side bars thereof formed inte- 15 in particular. grally with said ends. Each side bar is designed Another object of the invention is to provide with an approximate trapezoidal transverse a sectional design of chain link which, while section, with its portion of major thickness 10- affording, with a given mass of metal, high tensile cated on the outer side of the median longitudinal strength and rigidity of form,'will enlarge those axis of the side bar, and its portion of minor 20 surfaces which encounter the greater proportion thickness located on the inner side of said axis, of the abrasive influences incident to dragging with the result that each link presents, on each over the ground or from the shifting implngeof its broad faces, a concavity extending across ment of one link upon another. the link from one thicker portion to the other.

Still another object is to provide chain links while these thicker portions constitute raised 25 having a distribution of metal mass which not confines of said cavities at the outer margins only prolongs the duration of service of the links of the link. These cavities, however, terminate but leaves them freer to move one upon anshort of the end portions 8 which constitute the other and permits them to assume more desirable bearings through which each arcuate end rerelative positions when the chain is slack and to ceives the adjacent link, thus leaving the arcuate 30 more readily resume alignment and therefore ends unimpaired as to area of bearing surface lessen liability of entanglement or jamming, and rigidity against distortion or collapsing of when the chain is put under tension. the link when the chain is under tension.

The invention proceeds upon the principle of As furtheicontributing to rigidity of the link locating the larger portion of the metal mass on ends, each of said ends. as indicated by the lon- 35 the outside of the median longitudinal axes of gitudinal section at the left-hand end of Figure the side bars of the links, substantially throughi, is quadrilateral, being defined by two parallel out the length of said side bars, so that materisides 5 in the same planes with the cavity-definally less than one-half of said metal mass is to ing ridges 3, and inner and outer transverse be found within said median longitudinal sidesurfaces 8, i, curved preferably symmetrically to 40 bar axes; such distribution, however, terminateach other; at least the inner surface ii of each ing short of the interior and exterior end surlink end being transversely curved on a radius faces through which adjacent links inter-engage equal to that which determines the arcing of and hear one against'the other in transmitting each link and in the plane of the link; and the 5 their load; such distribution of metal in the two surfaces through which the link ends interenside bars of a link providing a materially reduced gage and enter into bearing one upon another, thickness of the inner portions of said side bars; when the chain is under tension, being thus and this decreased thickness preferably prevailmeasured in two directions by the rounded transing through the spacing strut (when the link has verse face of a link end. A further feature of one) and leaving the opposite faces of the link the preferred design of the links resides in ex- 50 concave and their concavities defined by the tensions 8 of the link ends tapering into merger ridges which the thickened portions of the side I with the cavity-defining ridges 3. provide along their outer margins. The result- 9 represents a strut introduced between the ant sections of the side-bars are thus trapezoidal inner reduced portions of the sides 2 and correin form; their major sides are perimetrically posponding substantially in thickness with said in- 55 ner sides, so that in addition to serving the conventionial function of link struts, these members 8 enter into novel relation with the face cavities of the links in that they form transverse botto that oil the sides at said ridges and thereby providing full bearing contact between the interengaging surfaces of the link: each face of .the link having its side ridges in the same plane with its end faces, and the end faces and side LEONARD T. HARRIS.

tom members of said cavities. ridges collectively providing in two parallel 5 From the foregoing, it will be seen that the planes perimetrically continuous ground conpresent invention contemplates a heavy duty tacting surfaces that define the link concavities. chain made of links, each of which is provided 2. Interengaging chain links as described in with outer marginal elevations or side bar ridges claim 1, in which the inner bearing faces through 10 which lend maximum thickness to the sides of which the ends of adjacent links interengage are 10 the link, and concavities defined by said ridges curved on substantially the same radii in both extending across the faces of the link; which said planes of the link ends sothat the load-transridges extend longitudinally in the two facial mitting faces are measured by dimensions corplanes of the link to the and sectors thereof responding substantially to the greater thickwhere they spread the maximum thickness ness of the links. I 15 throughout the full axial dimension of said end 3. Interengaging chain links as described in sectors and develop full transverse bearing areas claim 1, which also include struts between the on those portions through which the links insides 01' the links, said struts corresponding in terengage and transmit load when the chain is thickness substantially to the minor thickness under tens on. of the side bars and providing bottom members 20 I claim: for the cavities of the links.

1. In a chain, interengaging links each com- 4. A heavy duty chain as described in claim 1 prising side bars and closed ends; the side bars ,in which the ridge-forming raised portions conbeing of trapezoidal section with their minor tinue to the end sectors of the links and there thickness presented inwardly and their greater spreading to the inner marginal portion of said 25 thickness presented outwardly and thereby de end sectors, thereby lending maximum thickness veloping opposite concave faces upon the links to the inner portions of said sectors and prodefined by outer marginal ridges; the interenviding full transverse bearing areas through gaging ends of the links having their inner porwhich the links interengage and transmit their' tions corresponding in thickness substantially load when the chain is under tension. 30

CERTIFICATE OF CORRECTION. Patent No. 2,105,972. December 28, 1957.

LEONARD T. HARRIS.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, second column, line 25, claim 1 for the word "spreading" read spread; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 22nd day of February, A. D. 1958.

Henry Van Arsdale, (Seal) Acting Commissioner of Patents.

ner sides, so that in addition to serving the conventionial function of link struts, these members 8 enter into novel relation with the face cavities of the links in that they form transverse botto that oil the sides at said ridges and thereby providing full bearing contact between the interengaging surfaces of the link: each face of .the link having its side ridges in the same plane with its end faces, and the end faces and side LEONARD T. HARRIS.

tom members of said cavities. ridges collectively providing in two parallel 5 From the foregoing, it will be seen that the planes perimetrically continuous ground conpresent invention contemplates a heavy duty tacting surfaces that define the link concavities. chain made of links, each of which is provided 2. Interengaging chain links as described in with outer marginal elevations or side bar ridges claim 1, in which the inner bearing faces through 10 which lend maximum thickness to the sides of which the ends of adjacent links interengage are 10 the link, and concavities defined by said ridges curved on substantially the same radii in both extending across the faces of the link; which said planes of the link ends sothat the load-transridges extend longitudinally in the two facial mitting faces are measured by dimensions corplanes of the link to the and sectors thereof responding substantially to the greater thickwhere they spread the maximum thickness ness of the links. I 15 throughout the full axial dimension of said end 3. Interengaging chain links as described in sectors and develop full transverse bearing areas claim 1, which also include struts between the on those portions through which the links insides 01' the links, said struts corresponding in terengage and transmit load when the chain is thickness substantially to the minor thickness under tens on. of the side bars and providing bottom members 20 I claim: for the cavities of the links.

1. In a chain, interengaging links each com- 4. A heavy duty chain as described in claim 1 prising side bars and closed ends; the side bars ,in which the ridge-forming raised portions conbeing of trapezoidal section with their minor tinue to the end sectors of the links and there thickness presented inwardly and their greater spreading to the inner marginal portion of said 25 thickness presented outwardly and thereby de end sectors, thereby lending maximum thickness veloping opposite concave faces upon the links to the inner portions of said sectors and prodefined by outer marginal ridges; the interenviding full transverse bearing areas through gaging ends of the links having their inner porwhich the links interengage and transmit their' tions corresponding in thickness substantially load when the chain is under tension. 30

CERTIFICATE OF CORRECTION. Patent No. 2,105,972. December 28, 1957.

LEONARD T. HARRIS.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, second column, line 25, claim 1 for the word "spreading" read spread; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 22nd day of February, A. D. 1958.

Henry Van Arsdale, (Seal) Acting Commissioner of Patents. 

